CN106643637B - Inspection type principal strain measurement method for vibration measurement - Google Patents

Inspection type principal strain measurement method for vibration measurement Download PDF

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Publication number
CN106643637B
CN106643637B CN201710023100.XA CN201710023100A CN106643637B CN 106643637 B CN106643637 B CN 106643637B CN 201710023100 A CN201710023100 A CN 201710023100A CN 106643637 B CN106643637 B CN 106643637B
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strain
measurement
principal strain
inspection
signal
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CN106643637A (en
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朱学旺
王玉碧
张思箭
陈胜来
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General Engineering Research Institute China Academy of Engineering Physics
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General Engineering Research Institute China Academy of Engineering Physics
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B21/00Measuring arrangements or details thereof in so far as they are not adapted to particular types of measuring means of the preceding groups
    • G01B21/32Measuring arrangements or details thereof in so far as they are not adapted to particular types of measuring means of the preceding groups for measuring the deformation in a solid

Abstract

The invention discloses a kind of inspection type principal strain measurement methods for vibration measurement, it is realized by the inspection type principal strain measuring device for including intelligent multichannel switch, strain measurement amplification module and principal strain analysis module, the measurement method obtains corresponding equilibrium state parameter the following steps are included: balance adjustment before measuring to three channel signals;It saves;Set the patrol frequency of inspection measurement;Inspection measurement is carried out to three channel signals according to balance adjustment parameter and patrol frequency;Output signal is reconstructed according to mark signal, obtains the strain measurement value of three channel signals;Principal strain measurement data is calculated according to principal strain model and reconstruct data.The present invention is realized the measurement of the different directions strain of strain rosette and the measurement of principal strain, measuring system scale is reduced, convenient for management using integrated measuring device;By carrying out data reconstruction to the multiple signals of measurement, principal strain calculating is then carried out again, to obtain high-precision principal strain measurement data.

Description

Inspection type principal strain measurement method for vibration measurement
Technical field
The present invention relates to a kind of for straining the measurement method more particularly to a kind of use of class non-electrical parameter in vibration environment In the inspection type principal strain measurement method of vibration measurement.
Background technique
Vibration engineering research field, in vibration test, the acquisition of stress response generallys use strain measurement technique, Such as resistance-type strain measurement technique, the strain rosette being made of multiple and different direction foil gauges can be used at this time with equivalent amount Bridge box and strain measurement amplification module obtain the strain measurement of different directions as a result, and the principal strain that needs is surveyed in applying respectively Amount result then needs to obtain after post treatment.
Existing principal strain measurement method usually carries out independent inspection by multiple equipment to the signal of each foil gauge It surveys, enhanced processing, conformity calculation then is carried out to multiple signals, one side equipment is innumerable and disordered, on the other hand without passing through number According to reconstruct, the principal strain data precision finally obtained is lower.
Summary of the invention
The object of the invention is that providing a kind of high-precision patrolling for vibration measurement to solve the above-mentioned problems Inspection formula principal strain measurement method.
The present invention through the following technical solutions to achieve the above objectives:
A kind of inspection type principal strain measurement method for vibration measurement, by inspection type principal strain measuring device realize, The inspection type principal strain measuring device includes intelligent multichannel switch, strain measurement amplification module and principal strain analysis module, institute Three input terminals for stating intelligent multichannel switch have mark signal element, and when the road signal is connected in inspection, can generate can be only The mark signal of identification, the road Bing Yugai strain measurement signal or balanced signal synchronous driving to the strain measurement amplification module, The strain measurement amplification module includes measuring unit for measuring and amplifying, for realizing variable connector inspection working condition And it triggers mark signal and triggers the control unit of the inspection type measurement control of each input terminal voltage, for realizing each The storage of a input terminal equilibrium state parameter and the storage unit of calling, the principal strain analysis module includes for according to mark Signal reconstruction surveys the reconfiguration unit of dependent variable and for the measurement data according to stress state model calculating acquisition principal strain Analytical unit;
The inspection type principal strain measurement method for vibration measurement the following steps are included:
(1) strain measurement amplification module measures three channel signals R1, R2 and R3 of intelligent multichannel switch input Preceding balance adjustment obtains corresponding equilibrium state parameter P1, P2, P3;
(2) strain measurement amplification module is to the balance adjustment result before signal R1, R2 and R3 measurement with three groups of balance adjustments The form of parameter P1, P2, P3 save;
(3) patrol frequency f >=6fh of the inspection measurement of setting intelligent multichannel switch, fh are the highest of three strain signals Frequency;
(4) three channel signals R1, R2 and R3 are patrolled according to balance adjustment parameter P1, P2 or P3 and patrol frequency f Detection limit, the output of strain measurement amplification module are to go through mark signal N (t) and inspection measurement strain signal Y (t) two times Journey, wherein t is time of measuring;
(5) principal strain analysis module is reconstructed according to output signal of the mark signal to strain measuring and amplifying module, obtains The strain measurement value of three channel signals R1, R2, R3 are obtained, the specific method is as follows:
If inspection is measured since channel signal R1, then discrete data reconstructs format are as follows:
X1 (n)=Y (1+ (3n-1)),
X2 (n)=Y (2+ (3n-1)),
X3 (n)=Y (3+ (3n-1)),
Wherein, n=0,1,2 ... M is the number of output signal Y (t) discrete series of strain measurement amplification module, M Y (t) data length after discrete;The time interval of x1, x2, x3 are 3/f;
(6) principal strain analysis module calculates principal strain measurement data according to the reconstruct data of principal strain model and step (5), Principal strain model is determined according to strain regime theory and the plane distribution of three foil gauges.
Specifically, in the step (6), flat state be (0 °, 45 °, 90 °) strain rosette principal strain measurement data by Following formula calculates:
Flat state is that the principal strain measurement data of the strain rosette of (0 °, 60 °, 120 °) is calculated by following formula:
The beneficial effects of the present invention are:
The present invention is answered using integrated intelligent multichannel switch, strain measurement amplification module and principal strain analysis module, realization Become the measurement of the different directions strain of flower and the measurement of principal strain, measuring system scale is reduced, convenient for management;By to survey The multiple signals of amount carry out data reconstruction, principal strain calculating are then carried out again, to obtain high-precision principal strain measurement data.
Detailed description of the invention
Fig. 1 is the frame for the measuring device that the inspection type principal strain measurement method of the present invention for vibration measurement uses Figure;
Fig. 2 is to assume that mark signal N01, N02 or N03 are respectively 1/4,2/4 and the 3/4 of maximum setting range in embodiment When strain measurement amplification module inspection measure strain signal schematic diagram;
One of the signal schematic representation that Fig. 3 is obtained after the measurement strain signal of inspection shown in Fig. 2 is reconstructed;
The two of the signal schematic representation that Fig. 4 is obtained after the measurement strain signal of inspection shown in Fig. 2 is reconstructed;
The three of the signal schematic representation that Fig. 5 is obtained after the measurement strain signal of inspection shown in Fig. 2 is reconstructed.
Specific embodiment
Below with reference to embodiment and attached drawing, the invention will be further described:
Embodiment:
It is specifically described by taking the strain rosette of three foil gauges composition as an example below:
As shown in Figure 1, the inspection type principal strain measurement method of the present invention for vibration measurement is answered by inspection type master Become measuring device and realizes that the inspection type principal strain measuring device includes intelligent multichannel switch 1,2 and of strain measurement amplification module Principal strain analysis module 3, three input terminals 101,102,103 of intelligent multichannel switch 1 respectively with three bridge boxes of measuring nose 4 402 output end connection, the input terminal of three bridge boxes 402 are connect with the output end of three foil gauges 401 respectively, and intelligent multichannel is opened Closing 1 three input terminals 101,102,103 has mark signal element, and when the road signal is connected in inspection, can generate can be only The mark signal of identification, the road Bing Yugai strain measurement signal or balanced signal synchronous driving are to strain measurement amplification module 2, three tunnels Mark signal is respectively NO1, NO2, NO3, and strain measurement amplification module 2 includes measuring unit 201, the use for measuring and amplifying In realization variable connector inspection working condition and triggers mark signal and trigger the inspection type measurement of each input terminal voltage The control unit 202 of control, for realizing the storage of each input terminal equilibrium state parameter and the storage unit 203 of calling, Principal strain analysis module 3 includes for the reconfiguration unit 301 according to mark signal reconstruction actual measurement dependent variable and for according to stress State model calculates the analytical unit 302 for obtaining the measurement data of principal strain.
In conjunction with Fig. 1, the inspection type principal strain measurement method of the present invention for vibration measurement the following steps are included:
(1) strain measurement amplification module 2 surveys three channel signals R1, R2 and R3 that intelligent multichannel switch 1 inputs Balance adjustment before amount obtains corresponding equilibrium state parameter P1, P2, P3;
(2) strain measurement amplification module 2 is to the balance adjustment result before signal R1, R2 and R3 measurement with three groups of balance adjustments The form of parameter P1, P2, P3 save;
(3) set intelligent multichannel switch 1 inspection measurement patrol frequency f >=6fh, fh for three strain signals most High-frequency;
(4) three channel signals R1, R2 and R3 are patrolled according to balance adjustment parameter P1, P2 or P3 and patrol frequency f Detection limit, the output of strain measurement amplification module are to go through mark signal N (t) and inspection measurement strain signal Y (t) two times Journey, wherein t is time of measuring;Such as: when marking signal is N01, calls balance adjustment parameter P1 to measure, measure at this time It as a result is the strain measurement value of signal R1;When marking signal is N02, calls balance adjustment parameter P2 to measure, survey at this time Measure the strain measurement value that result is signal R2;When marking signal is N03, balance adjustment parameter P3 is called to measure, at this time Measurement result is the strain measurement value of signal R3;It is respectively maximum setting range Fig. 2 shows mark signal N01, N02 or N03 1/4,2/4 and 3/4 when strain measurement amplification module 2 inspection measure strain signal;
(5) principal strain analysis module is reconstructed according to output signal of the mark signal to strain measuring and amplifying module, obtains The strain measurement value of three channel signals R1, R2, R3 are obtained, if N (t)=N01, Y (t) are the strain measurement value of channel R1, i.e., X1 (t)=Y (t);And so on, if N (t)=N02, Y (t) they are the strain measurement value of channel R2, i.e. x2 (t)=Y (t);If N (t)=N03, then Y (t) is the strain measurement value of channel R3, i.e. x3=Y (t);
The specific method is as follows for this step:
If inspection is measured since channel signal R1, then discrete data reconstructs format are as follows:
X1 (n)=Y (1+ (3n-1)),
X2 (n)=Y (2+ (3n-1)),
X3 (n)=Y (3+ (3n-1)),
Wherein, n=0,1,2 ... M is the number of output signal Y (t) discrete series of strain measurement amplification module, M Y (t) data length after discrete;The time interval of x1, x2, x3 are 3/f;
It is logical that Fig. 3, Fig. 4 and Fig. 5 respectively illustrate three for measuring inspection shown in Fig. 2 and obtaining after strain signal is reconstructed The signal of the signal in road, reconstruct has higher precision;
(6) principal strain analysis module calculates principal strain measurement data according to the reconstruct data of principal strain model and step (5), Principal strain model is determined according to strain regime theory and the plane distribution of three foil gauges;
Specifically, in this step, flat state is the principal strain measurement data of the strain rosette of (0 °, 45 °, 90 °) by as follows Formula calculates:
Flat state is that the principal strain measurement data of the strain rosette of (0 °, 60 °, 120 °) is calculated by following formula:
Above-described embodiment is presently preferred embodiments of the present invention, is not a limitation on the technical scheme of the present invention, as long as Without the technical solution that creative work can be realized on the basis of the above embodiments, it is regarded as falling into the invention patent Rights protection scope in.

Claims (2)

1. a kind of inspection type principal strain measurement method for vibration measurement is realized, institute by inspection type principal strain measuring device Stating inspection type principal strain measuring device includes intelligent multichannel switch, strain measurement amplification module and principal strain analysis module, described Three input terminals of intelligent multichannel switch have mark signal element, and when the road signal is connected in inspection, can generate only can know Other mark signal, the road Bing Yugai strain measurement signal or balanced signal synchronous driving are to the strain measurement amplification module, institute State strain measurement amplification module include measuring unit for measuring and amplifying, for realizing variable connector inspection working condition simultaneously Triggering mark signal and the inspection type for triggering each input terminal voltage measure the control unit of control, for realizing each The storage of input terminal equilibrium state parameter and the storage unit of calling, the principal strain analysis module include for being believed according to mark Number reconstruct actual measurement dependent variable reconfiguration unit and for according to stress state model calculate obtain principal strain measurement data point Analyse unit;It is characterized by: the inspection type principal strain measurement method for vibration measurement the following steps are included:
(1) before strain measurement amplification module measures three channel signals R1, R2 and R3 of intelligent multichannel switch input Balance adjustment obtains corresponding equilibrium state parameter P1, P2, P3;
(2) strain measurement amplification module is to the balance adjustment result before signal R1, R2 and R3 measurement with three groups of balance adjustment parameters The form of P1, P2, P3 save;
(3) patrol frequency f >=6fh of the inspection measurement of setting intelligent multichannel switch, fh are the most high frequency of three strain signals Rate;
(4) inspection survey is carried out to three channel signals R1, R2 and R3 according to balance adjustment parameter P1, P2 or P3 and patrol frequency f Amount, the output of strain measurement amplification module are that mark signal N (t) and inspection measure strain signal Y (t) two time histories, Middle t is time of measuring;
(5) principal strain analysis module is reconstructed according to output signal of the mark signal to strain measuring and amplifying module, obtains three The strain measurement value of a channel signal R1, R2, R3, the specific method is as follows:
If inspection is measured since channel signal R1, then discrete data reconstructs format are as follows:
X1 (n)=Y (1+ (3n-1)),
X2 (n)=Y (2+ (3n-1)),
X3 (n)=Y (3+ (3n-1)),
Wherein, n=0,1,2 ... M, is the number of output signal Y (t) discrete series of strain measurement amplification module, and M is Y (t) Data length after discrete;The time interval of x1, x2, x3 are 3/f;
(6) principal strain analysis module calculates principal strain measurement data according to the reconstruct data of principal strain model and step (5), and master answers Varying model is determined according to strain regime theory and the plane distribution of three foil gauges.
2. the inspection type principal strain measurement method according to claim 1 for vibration measurement, it is characterised in that: the step Suddenly in (6), flat state is that the principal strain measurement data of the strain rosette of (0 °, 45 °, 90 °) is calculated by following formula:
Flat state is that the principal strain measurement data of the strain rosette of (0 °, 60 °, 120 °) is calculated by following formula:
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CN109373965B (en) * 2018-11-28 2021-01-01 西安航天动力测控技术研究所 Three-axis 60-degree strain sensor pasting device and method suitable for strain measurement

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CN201707125U (en) * 2010-05-14 2011-01-12 张正龙 Wireless vibration on-line detector and vibration detecting system adopting detector
CN104794771A (en) * 2015-04-22 2015-07-22 北京京能高安屯燃气热电有限责任公司 Tour spot inspection automatic planning method and apparatus
CN105910779A (en) * 2016-05-09 2016-08-31 中国地震局工程力学研究所 Bridge beam body deformation sensing system and sensor

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CN101436046A (en) * 2008-12-08 2009-05-20 东南大学 Integrated multichannel synchronous oscillation data acquiring and monitoring and analysis diagnostic device
CN101639347A (en) * 2009-09-01 2010-02-03 长春理工大学 Multisurface measuring method of double station cooperative type large structural part
CN201707125U (en) * 2010-05-14 2011-01-12 张正龙 Wireless vibration on-line detector and vibration detecting system adopting detector
CN104794771A (en) * 2015-04-22 2015-07-22 北京京能高安屯燃气热电有限责任公司 Tour spot inspection automatic planning method and apparatus
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